I seriously doubt that Ebay or Craigs list are going to do anything about watching for these items. They've got better things to worry about than a bunch of stolen toy guns. It's likely you'll see these things up on ebay.

They have better things to do than to enter a list of stolen items into a database scan script that is designed to compare items being sold to seller's general location? Really isn't that hard, and takes next to no effort on their part once such a system is up and running.